This is very interesting. Researchers are making biodiesel from used coffee grounds, which once used (again) can still be used for compost and (I didn’t know this) for fuel pellets. I so want to try making fuel pellets out of coffee grinds. Read more here: Coffee grounds for biodiesel
One of my customers once experimented with combining milk bottle plastic and used coffee grinds. It worked pretty well. There are resources all around us.
